Drafting instrument



Feb. 3, 1953 L. A. CANGIALOSI 2,627,116

DRAFTING INSTRUMENT Filed Marh 26, 1951 FIG. 4.

INVENTOR. LIV/O ARTHUR cAA/e/ALos/ ATTORNEKS Patented Feb. 3, 1953 'UNITED STATES PATENT OFFICE- I DRAFTING INSTRUMENT Livio Arthur CangialosLBrooklyn, N. Y. Application March 26, 1951, Serial No. 217,501

3 Claims.

- This invention relates to a new and improved triangle for draftsmen, its principal object being to provide a drafting instrument for producing a plurality or series of spaced parallel lines with out the use of another triangle, T-square or other drafting instrument.

The means for accomplishing the foregoing object has the following features and advantages:

(a) The device can be readily and easily manipulated;

(b) The triangle is not rendered bulky or inconvenient to handle; (c) The triangle has far greater utility than the conventional draftsmans triangle;

(at) Any selected edge of the triangle may be employed for drawing the desired parallel lines;

(e) It consists of a minimum number of parts;

and

(f) It is economical to manufacture.

Other objects of the invention will be apparent from the following description and drawing which illustrates a preferred embodiment thereof:

Fig. l is a top plan view of the improved triangle;

Fig. 2 is an enlarged sectional view on the line 2-2 of Fig. l; v

Fig. 3 is a partial top plan view showing the slide member which serves as a holding memher, in an intermediate position, and

Fig. 4 is a View similar to Fig. 1, illustrating the manner in which the instrument is used to produce a plurality of parallel lines.

Referring to the drawing in detail, this shows a flat triangle T, which can be made or molded from plastic, celluloid, metal, wood or any other desired material. In configuration and material, the said triangle T is similar to the conventional types of draftmens triangles.

A longitudinal slot or out-out I is formed in the body of triangle T, the said recess being 0ptionally and preferably parallel to the planar longitudinal or hypotenuse edge I I of the said triangle. The said slot I0 is bounded respectively by the upper and lower longitudinal edges I2 and I3 and the side edges l4 and I5. As clearly shown in Fig. 2, each said longitudinal edge I2 and I3 is inwardly beveled to respectively provide the upper and lower longitudinal angular grooves H11 and [3a, the purpose or which will hereinafter be explained.

Slidably located in elongated slot I0 is the rectangular slide member it, which has the upper and lower beveled longitudinal edges I1 and I8 and the side edges I9 and 20. The said slide 2 member H3 is slidably retained in said slot l0 by its beveled longitudinal edges I"! and 18 which enter and fit within the longitudinal grooves 12a and Ilia. The said slide member I6 is of greater thickness than the body of triangle T, so that the top and bottom planar faces thereof project above the top and bottom planar faces of said triangle. The said slide member It may be made or molded from the same or difierent material'from which triangle T is made or molded.

A raised thumb-grip or finger-rest Zla is provided adjacent side edge [4 of slot ID on the top face of triangle T, and similarly a finger-rest 21b is provided adjacent side edge 15 of saidslot. The said thumb-grips may be integral with triangle T or may be separately mounted thereon in any convenient manner. The said thumbgrips are of such configuration so as to provide convenient fixed means for the thumb to move said triangle T relative to slide member [6 when the latter acts as a holding member, whichwill hereinafter be more fully described. The said thumb-grips may be eliminated if desired, or one may be provided instead of two as shown. Further, if desired, an indentation or aperture may be provided in lieu-oi the thumb-grips or rests la and 2 lb with equal effect.

Fig. 4 clearly depicts the manner in which the rality of spaced parallel lines L. The-triangle is placed on the paper or surface S on which the lines L are to be drawn. The slide-member I6 is then held in fixed position against'said'paper by placing one or more of the fingers-of the user thereon. The thumb of the user can then be positioned against either thumb-grips or rests 2Ia or 2 lb to shift triangle T in either direction relative to said fixed slide member [6. As shown in Fig. 2, the bottom face of triangle T is spaced from the surface S, and only the bottom face of slide member l5 abuts the said surface. Hence, the said triangle T can be freely slid in either direction when follower or slide member I6 is held in fixed position. When so fixed, the said follower or slide member [6 serves as a holding member. By moving the point of a pencil P along either edge 22 or 23 of triangle T, a line L can be produced on surface S. By then shifting the said triangle in either direction, a plurality of spaced parallel lines L can be drawn against either of said selected edges without the use of any other drafting instrument. It will be noted that lines L are all parallel to either of selected edges 22 or 23 of triangle T along which they are drawn.

As shown in Fig. 2, the grooves of the slot and the side edges of the slide member I6, in forming the slideway, are dimensioned to provide a loose fit between these elements so that when in normal relationship the triangle is freely movable to the held member I'B by simply applying pressure by the thumb in the direction of length of the slot. As is apparent from Fig. 4, the thumb is also in position to apply a downward pressure on the top face of the triangle, and since the latter is normally spaced above the surface of the sheet receiving the lines by the excess thickness of member [6, the loose fit will permit such downward pressure to move the adjacent edge of the triangle toward the surface being marked, thereby enabling more accurate marking of the lines. Such downward movement of the triangle edge tends to provide the additional advantage of tending to slightly change the angularity of the respective slideway faces relative to each other within the length of member I6, thus tending to provide a slight friction therebetween, the latter tending to prevent sliding movement of the triangle by the pressure of the pencil while the latter is making the mark. Release of such downward pressure enables the triangle to resume the normal loose fit relation in the slideway for ready adjustment of the triangle to its succeeding position.

To assist in procuring the desired distances between lines L, a calibrated scale is provided on the top face of triangle T adjacent upper longitudinal edge [2 of slot Ill. The scale can be shifted relative to the slide member l6 and set at any desired marking.

There has been illustrated and described a preferred embodiment of the invention, but it is obvious that various changes and omissions may be made without departing from its spirit. The invention can be applied to any type of draftsmans triangle, and slot or cut-out It] can be adjacent and parallel to any edge of the triangle. Of course, it would not be departing from the scope of the invention if the said slot or cut-out were not parallel to any edge of the triangle. In addition, the longitudinal grooves in and [3a may be eliminated if means are provided on the slide member I6 for otherwise retaining the same in the slot or cut-out. If desired, the sides of triangle T can be beveled.

What is claimed is:

1. A draftsmans triangle for drawing a plurality of spaced parallel lines, comprising a triangle body having three side edges and an elongated slot therein extending parallel to one of said edges, opposite longitudinal side walls of the slot being grooved to form a slideway of material length, a slide member having a length dimension equal to a fraction of the slot length and having its longitudinal side edges of a configuration complemental to the grooved slideway to provide a loose fit relation therewith to thereby permit free sliding movement therebetween, the bottom face of the slide member extending below the planar face of the triangular body to abut the Surface upon which the lines are to be drawn as determined by finger pressure of the user to thereby maintain the position of the member, said triangular body having its upper face provided with thumb engaging means adjacent at least one slot end for shifting the body longitudinally of the member for positioning the body for line drawing action by thumb movement and to maintain the body in such adjusted position by downward pressure of the thumb on the body in the selected position to carry the body line drawing edge in the direction of contact with the drafting surface with the movement active to tighten the relation of the opposite faces within the slideway and thereby maintain the position of the triangle during the line drawing activity.

2. An assemblage as in claim 1 characterized in that the thumb engaging means is in the form of an upwardly extending projection on the upper face of the triangle body adjacent to but spaced from the slot end, the outer lateral face of the projection being arcuately concave to approximate contour lines of the ball of the thumb of the user with the side of the thumb available for providing the downward pressure.

3. An assemblage as in claim 1 characterized in that one of the marginal side edges of the slot carries calibrating indicia, the adjacent edge zone of the sliding member having an index pointer on its upper face adapted to be cooperative with either of the calibrations to locate the triangle in its line drawing position.

LIVIO ARTHUR CANGIALOSI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 290,210 Conant Dec. 18, 1883 2,368,344 Caruso Jan. 30, 1945 FOREIGN PATENTS Number Country Date 509,270 Great Britain July 13, 1939 

